Logitech FAQ Resource Central

Did you know that the Logitech Z-5500 Digital speakers have boost mode? What does it mean? Boost mode simply let you go beyond the maximum capable volume of the control pod.

To achieve boost mode, keep turning the volume knob in a clock-wise direction until you completely max out the volume bar on the control pod. Continue turning the knob for a couple of rounds will put the control pod into boost mode. The maximum boost for this stage will be boost 11.

There are 2 types of boost mode available for the Z-5500; boost 11 and boost 22. Boost 11 is the easiest to unlock which I have mentioned above. However, to achieve boost 22 will require an extra step. When the control pod screen shows boost 11, hold down the mute button and continue to turn the volume knob. You will then unlock boost 12-22.

It may seem cool to be able to play at such loud volume to annoy your neighbours. However, I discourage anyone from going into boost mode. Reason being that the amplifier may not be able to handle the load for a long period of time before failing. In my opinion, even 3/4 volume is already too much for me to bear.